| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Journal of Animal Science, Vol 68, Issue 11 3727-3735, Copyright © 1990 by American Society of Animal Science
JOURNAL ARTICLE |
A. E. Pusateri, M. F. Rothschild, C. M. Warner and S. P. Ford
Dept. of Anim. Sci., Iowa State University, Ames 50011.
Days 9 to 12 of gestation in the pig are marked by a pronounced asynchrony among littermate embryos. Previously published studies have suggested that the most advanced embryos within a litter by d 12 synthesize greater amounts of estrogen. Embryonic estrogen secretion has been shown to advance endometrial secretions, which may adversely affect less-developed littermates. To date, however, no comprehensive study of the developmental pattern and synthetic activities of individual littermate embryos during this period has been conducted. Litters were collected from Yorkshire gilts on d 9 (n = 11), 11 (n = 10), 12 (n = 5) and 13 (n = 8). Size (greatest diameter), DNA content (cell number), protein:DNA ratio and estrone (E1) and estradiol-17 beta (E2) content were determined for each embryo. Embryo sizes (mm greatest diameter) were (x +/- SEM) 1 +/- .1, 5.6 +/- .7, 41.2 +/- 11.7 and 405.7 +/- 16.7 on d 9, 11, 12 and 13, respectively. The daily variation in embryo size, expressed as CV was 82% on d 9, 145% on d 11, 206% on d 12 and 46% on d 13. DNA per embryo increased progressively from d 9 to 13, whereas the protein:DNA ratio declined. Content of E1 and E2 per embryonic cell was greatest on d 11 and d 12 before declining markedly on d 13. Cell number and embryo size were correlated positively in embryos 1 to 7 mm (P less than .01) and embryos greater than 100 mm (P less than .01) but not in embryos 8 to 100 mm.(ABSTRACT TRUNCATED AT 250 WORDS)
This article has been cited by other articles:
|
|
 |
|
  L. Blomberg, K. Hashizume, and C. Viebahn Blastocyst elongation, trophoblastic differentiation, and embryonic pattern formation Reproduction, February 1, 2008; 135(2): 181 - 195. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. Waclawik and A. J Ziecik Differential expression of prostaglandin (PG) synthesis enzymes in conceptus during peri-implantation period and endometrial expression of carbonyl reductase/PG 9-ketoreductase in the pig J. Endocrinol., September 1, 2007; 194(3): 499 - 510. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. A. Blomberg, E. L. Long, T. S. Sonstegard, C. P. Van Tassell, J. R. Dobrinsky, and K. A. Zuelke Serial analysis of gene expression during elongation of the peri-implantation porcine trophectoderm (conceptus) Physiol Genomics, January 20, 2005; 20(2): 188 - 194. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. A. Kowalski, D. S. Vale-Cruz, F. A. Simmen, and R. C.M. Simmen Uterine Androgen Receptors: Roles in Estrogen-Mediated Gene Expressionand DNA Synthesis Biol Reprod, May 1, 2004; 70(5): 1349 - 1357. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Vallee, D. Beaudry, C. Roberge, J. J. Matte, R. Blouin, and M.-F. Palin Isolation of Differentially Expressed Genes in Conceptuses and Endometrial Tissue of Sows in Early Gestation Biol Reprod, November 1, 2003; 69(5): 1697 - 1706. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. W. Ross, J. R. Malayer, J. W. Ritchey, and R. D. Geisert Characterization of the Interleukin-1{beta} System During Porcine Trophoblastic Elongation and Early Placental Attachment Biol Reprod, October 1, 2003; 69(4): 1251 - 1259. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. A. Kowalski, L. G. Graddy, D. S. Vale-Cruz, I. Choi, B. S. Katzenellenbogen, F. A. Simmen, and R. C.M. Simmen Molecular Cloning of Porcine Estrogen Receptor-{beta} Complementary DNAs and Developmental Expression in Periimplantation Embryos Biol Reprod, March 1, 2002; 66(3): 760 - 769. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
